Envelope



S. FLIS ET AL Dec. 31, 1929.

ENVELOPE Filed March 12, 1928 Patented Dec. 31, 1929 PATENT OFFICE STAN'ISLAW FLIS AND MATEUSZ KASPRZAK, OF GOWANDA, NEW YORK ENvELorE Application filed March 12, 1928. serial No. 261,003.

This invention relates to improvements in envelopes, and it is the principal object of the invention to provide an envelope which ensures absolute security for its contents and which will at once make visible if any attempt by unauthorized persons is made to open the envelope.

Another object of our invention is the provision of an envelope blank allowing an interengagement between the several flaps thereof and a secure closing of the whole about a letter.

A further object of our invention is the provision of an envelope of simple and inexpensive construction presenting an additional security against stealthy opening by allowing the final flap to be folded upon the front face of the envelope and sealed by a stamp placed on said flap and envelope.

These and other objects of the invention will become more fully apparent, as the description proceeds and will then be specifically defined in the appended claim.

In the accompanying drawing, forming a 25 material part of this disclosure Fig. 1 is a blank from which the envelope according to the present invention is made.

Fig. 2. illustrates the first step in the forma tion of the envelope.

Fig. 3 illustrates the second step.

Fig. 4 shows the envelope made according to the present invention nearly closed, in rear View.

Fig. 5 is an end view thereof seen in the direction of the arrows 55, of Figure 4.

Fig. 6 is a front view of the closed and folded envelope.

As illustrated, the envelope comprises a central or body part 10 of substantially rec- AG tangular shape having made integrally therewith at opposite ends the flaps 11 and 12 and at oppositely disposed sides the flaps 13 and 14 respectively also made integrally with the body part 10.

The flap 11 has in its upper edge near the outer end of the flap an oblique incision 15, while the flap 12 has a similar incision 16 in its lower edge near its end.

The flap 14 has a similar incision 17 in its leftmargin near its upper end, and the closing flap 13 of a form best shown in Figure 1 has its end formed into the shape of a tongue 18 adapted to be folded against the body of flap 13 along a line 19, while the end flaps 11 and 12 can be folded against the inner face of the body part 10 along lines 20, 21, r'e'spectively and flaps 14 and 13 are foldable against body 10 along line-s 22, 23 respectively.

My device operates as follows If it is desired to fold the envelope, the flaps 11 and 12 are folded against body 10 along lines 20, 21, respectively and then the end tongue 24, of flap 11 is entered into slot 15 of tongue 11 and the end tongue 25 of flap 11 is entered into incision 16 of flap 12 so that the parts take up the relative positions shown in Figure 2.

Now the flap 14 is folded along line 22 upon the two engaged flaps 11 and 12, with the flap 12 entering the incision 17. If the inner gummed part or margin 26 of flap is moistened and is now pressed against the lower flaps, the envelope will be ready for the reception of a letter, etc, as illustrated in Figure 3.

Then the flap 13 is folded along line 23 upon the parts described so far and will be closed by pressing the previously moistened gummed margins 27, down upon the other folded parts as shown in Figure 4.

If it is now desired to finally close the envelope, the tongue 18 has its gummed part 28 moistened and folded along line 19 upon the front face of body part 10 as shown in Figure 6. If now a stamp 29 is placed so as to partly cover tongue 1.9 and the body part 10 as shown in Figure 6 an additional security will be had.

It will be evident that in this manner an envelope is formed which, when sealed will offer the greatest possible security against opening by unauthorized persons so that any attempt to open it will become visible at once,

- and it is to be understood that while we have shown and described as one example the preferred form of envelope, we may make such changes in the making of the blank and in its folding as come within the scope of the appended claim without deviation from the invention.

Having thus described our invention What We claim as new and desire to protect by Letters Patent is In an envelope of the class described, a blank, a pair of end flaps obliquely slotted near their ends on said blank, and adapted to be folded against its rear face, means forinedby said slots allowing an interengage- Inent between both flaps in their folded position, a side flap having an obliquely disposed slot near its outer edge adapted to be folded upon said end flaps, one of said end flaps engaging in the recess of said side flap, a cover flap, adapted to be folded over said end and side flaps in their folded positions, and a tongue on said cover flap adapted to be folded over the front face of said envelope to securely close the same at its right hand upper corner adapted to receive the postage stamp allowing an opening of the envelope only by tearing said stamp.

Signed at GoWanda, in the county of Cattaraugus and State of New York, this 14th day of February, A. D. 1928.

STANISLACW FLIS. MATEUSZ KASPRZAK. 

